LINQ：选择对象不包含从列表项 [英] LINQ: Select where object does not contain items from list

问题描述

我在这里LINQ语法挣扎......以为我会折腾出在这里。我不能准确地找到我要找的其他地方。

I'm struggling with LINQ syntax here...thought I'd toss it out here. I cant find exactly what I'm looking for anywhere else.

OK，说我有这样的：

OK, say I've got this:

public class Bar
{
   public int BarId { get; set; }
}

public class Foo
{
   public List<Bar> BarList { get; set; }
}

List<Foo> fooBunch = GetABunchOfFoos(); //let's just assume I'm getting more than one
List<Foo> fooSelect = new List<Foo>;
List<Bar> filterBars = GetAFewBars(); //assume I'm getting like 2 or 3

fooSelect = (from f in fooBunch
             where !(from b in f.BarList select b.BarId).Contains(ITEM FROM filterBars.BarId)
             select f).ToList();

所以，长话短说我想使用LINQ过滤掉我的基础上从另一个列表中对象的对象列表。我希望这是有道理的。我想我只是失去了对包含部分......我不知道怎么写了。

So, long story short I want to use LINQ to filter out my list of objects based on objects from another list. I hope this makes sense. I think I'm just lost on the Contains portion...I don't know how to write that.

推荐答案

在一般情况下，你要寻找的除了扩展名。

In general, you're looking for the "Except" extension.

var rejectStatus = GenerateRejectStatuses();
var fullList = GenerateFullList();
var rejectList = fullList.Where(i => rejectStatus.Contains(i.Status));
var filteredList = fullList.Except(rejectList);

在这个例子中，GenerateRegectStatuses（）应该是你想拒绝的状态列表（或根据你的榜样，更具体而言，一个列表＆LT; INT＆GT; 的标识）

In this example, GenerateRegectStatuses() should be the list of statuses you wish to reject (or in more concrete terms based on your example, a List<int> of IDs)

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